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Submitted on: 18 February 1999.
Revised on: 24 May 1999.
Accepted on: 22 July 1999.
___________________Applied Catalysis B-Environment and Energy
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Submitted on: 09 September 1999.
Revised on: 08 December 1999.
Accepted on: 03 January 2000.
___________________Applied Catalysis B-Environment and Energy
Submitted on: 08 November 2009.
Revised on: 16 January 2010.
Accepted on: 08 March 2010.
___________________Applied Catalysis B-Environment and Energy
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